Understanding primary axillary hyperhidrosis
Primary axillary hyperhidrosis is defined as disproportionate sweat production in the underarms, without any identifiable pathological cause (such as an endocrine or neurological condition). It generally occurs symmetrically, often from adolescence, and tends to persist into adulthood.
The mechanism involves overactivity of the eccrine sweat glands, which produce sweat. These glands are stimulated by cholinergic nerves, themselves controlled by the sympathetic nervous system. In patients with hyperhidrosis, this activation is excessive, even without heat, exertion or significant stress.
Clinically, this excessive sweating causes visible sweat patches, a constant sensation of dampness and sometimes skin irritation. Beyond the purely physical effects, the psychological impact is considerable : restricted clothing choices, social avoidance and discomfort at work or in professional settings.
Botulinum toxin for treating excessive sweating
Botulinum toxin, derived from a purified protein, acts specifically on nerve transmission. It temporarily blocks the release of acetylcholine at cholinergic nerve endings. This substance is precisely what stimulates the eccrine sweat glands.
By inhibiting this transmission, botulinum toxin prevents the gland from receiving the secretion signal : sweat production decreases significantly, while the skin's other physiological functions remain intact.
Treatment does not aim to eliminate sweating completely, but to bring it back to a normal, comfortable level. The goal is dry skin in everyday life, without compromising the body's natural temperature regulation.
Effectiveness is well documented : studies show an 80 to 90 % reduction in sweating in the weeks following injection. The effects last between 6 and 9 months on average, depending on the individual.
The areas concerned : the specific case of the underarms
Excessive sweating can affect several areas of the body : palms, soles, face or scalp. However, botulinum toxin is not indicated for all these locations.
The medical indication officially recognised and approved by health authorities is primary axillary hyperhidrosis, meaning excessive underarm sweating of idiopathic origin.
This area responds particularly well to treatment for several reasons : its high concentration of eccrine sweat glands ; the accessible, even injection surface ; the low density of motor nerve endings, reducing the risk of side effects ; the excellent skin tolerance observed clinically.
Effectiveness in this area is remarkable : most patients notice a significant improvement from the second week, with an almost complete reduction in sweat patches and local dampness. This improvement brings immediate social and professional comfort.
Immediate aftercare and resuming activities
After the session, it is advisable to avoid exercise, saunas or hot baths for 24 hours, to avoid encouraging the product to spread. The skin may show slight redness or small temporary raised bumps, which resolve spontaneously within a few hours.
No social downtime is required : professional and personal activities can be resumed immediately.
The first effects appear after 3 to 5 days, with an optimal result in around two weeks. The skin gradually becomes dry and sweat patches disappear.
The effect of treatment lasts an average of 6 months. A further session is recommended when sweating reappears, before symptoms return fully.
The expected benefits of treatment
Treated patients report a major improvement in quality of life : clothing stays protected, comfort increases, social anxiety decreases and self-confidence improves. Although straightforward, the procedure has a considerable psychological impact.
From a medical perspective, botulinum toxin allows sweat secretion to return to normal functioning without impairing overall temperature regulation. Untreated glands elsewhere on the body provide sufficient sweating to maintain body temperature.
This approach also has the advantage of avoiding more invasive options such as surgical sympathectomy, which carries risks of complications or compensatory hyperhidrosis.
Side effects
Botulinum toxin treatment is safe when performed by an experienced doctor trained in the procedure. Adverse effects are rare, temporary and usually mild.
Possible local reactions include : temporary tenderness at the injection site ; slight bruising or redness ; in very rare cases, a sensation of local muscle weakness that resolves within a few days.
Treatment must always be preceded by a thorough medical consultation to rule out contraindications and ensure patient safety.
Results and long-term follow-up
Most patients experience consistent effectiveness after several sessions. The body does not develop significant tolerance, and results may even improve over time through a gradual reduction in sweat gland activity.
It is important to note that the effect of botulinum toxin is temporary : nerve function naturally resumes after several months. This reversibility ensures treatment safety, allowing personalised adjustments at each session.
Regular follow-up allows the frequency of injections to be adjusted and overall hyperhidrosis care to be optimised.
Injections can be repeated without loss of effectiveness, with an average interval of 5 to 6 months depending on the patient and treated area.
Other treatment options : comparison and complementary approaches
Botulinum toxin injections are now the reference treatment for primary axillary hyperhidrosis. Other approaches exist, but have limitations :
- Antiperspirants based on aluminium salts are often ineffective in severe forms.
- Iontophoresis, useful for the hands and feet, is not suited to the underarm area.
- Surgical sympathectomy, although permanent, carries significant risks (compensatory sweating, neuropathic pain).
Botulinum toxin therefore stands out as the method of choice : non-invasive, safe, effective and reversible.
Choosing a doctor in Geneva to treat excessive sweating
In Geneva, treatment of axillary hyperhidrosis with botulinum toxin should be performed by an experienced doctor trained in injection techniques and skin anatomy. The doctor's professionalism, the quality of the product used and the precision of the procedure underpin an optimal result that is both natural and lasting.
The doctor always adjusts the dose and distribution of injection points to each patient's specific characteristics : the size of the underarm area, sweating intensity and skin sensitivity. This personalisation is essential for the right balance between effectiveness and comfort.
